The best outside mount chimney cap is one sized to fit the exterior dimensions of your existing flue tile. The HY-Guard is best for a 13-by-18-inch tile, while the Stanbroil offers an adjustable outside-mount design. For other sizes, consider the 9-by-18-inch galvanized cap or the adjustable stainless steel options from BUYYAH and LTSEAME. Measure the tile before choosing; the products below list different fit ranges and materials.
| Product | Best For | Material | Listed Fit |
|---|---|---|---|
| HY-Guard HG1318 | Specified clay tile dimensions | Galvanized steel | 11½ × 16½ to 13¼ × 18¼ inches |
| Stanbroil 14 × 19 | Adjustable mounting options | Galvanized steel | Check size selection |
| 9 × 18 Chimney Cap | Smaller flue tiles | Galvanized steel | 7½ × 16½ to 9½ × 18½ inches |
| BUYYAH 14 × 21 | Adjustable stainless steel fit | 304 stainless steel | 11.7 × 18.7 to 16.4 × 23.4 inches |
| LTSEAME 18 × 21 | Larger flue tiles | Stainless steel | 16 × 19 to 21 × 24 inches |
HY-Guard HG1318 Bolt-On Chimney Cover
The HY-Guard HG1318 is best for homeowners with a single clay or masonry flue tile whose outside dimensions fall between 11½ by 16½ inches and 13¼ by 18¼ inches. Its bolt-on design attaches to the outside of the existing tile, and the product features a powder-coated finish.
The ¾-inch mesh is intended to help keep birds, animals, leaves, and debris out while shielding the flue from rain and snow. The outside mounting design leaves free air space around the flue, which the manufacturer describes as supporting draft.
Choose this if your tile measurements fit the listed range and you want a bolt-on cover. Limitation: the fixed fit range makes it unsuitable for tiles outside those dimensions.
Stanbroil Adjustable Outside-Mount Chimney Cap
The Stanbroil cap is best for buyers who want mounting flexibility for an existing clay flue. Its listed size is 14 by 19 inches, and the product description specifies an adjustable bottom with side- or bottom-mount installation options. It is made from galvanized steel.
The tight grid is designed to block birds, animals, and leaves while helping prevent rainwater from entering the flue. The mesh also allows ventilation. The product listing says multiple sizes are available, so check the selected size and its fit details before ordering.
Choose this if you need an adjustable mounting arrangement. Limitation: the supplied details do not state a precise fit range for the 14-by-19-inch version, so confirm the dimensions before purchase.
9 × 18-Inch Galvanized Steel Chimney Cap
This cap is best for a smaller existing single-flue tile. It fits outside tile dimensions from 7½ by 16½ inches to 9½ by 18½ inches. The product lists a 14-gauge galvanized steel base and a 24-gauge galvanized steel hood.
A mesh screen and hood are designed to help keep out animals, birds, rain, snow, and leaves. The manufacturer also identifies protection from certain downward drafts and describes the cap as supporting ventilation.
Choose this if your flue falls within its specific fit range and you want a galvanized steel option. Limitation: its dimensions make it a poor fit for larger tiles; measure the outside of the flue rather than relying on the nominal 9-by-18-inch label alone.
BUYYAH Adjustable 14 × 21-Inch Stainless Cap
The BUYYAH cap is best for buyers seeking an adjustable outside fit in stainless steel. Its listed fit range is 11.7 by 18.7 inches to 16.4 by 23.4 inches. Bolts and extended edges are provided to adjust the bottom for different flue dimensions.
The cap is made from 304 stainless steel. Its hood and mesh are designed to help block birds, small animals, rain, snow, leaves, and debris while allowing ventilation. Those details make it a useful option when a fixed-size cap is not a close match.
Choose this if your tile dimensions fall within the stated range and you want stainless steel construction. Limitation: it will not fit flues outside that range, even with the adjustable edges.
LTSEAME Adjustable 18 × 21-Inch Chimney Cap
The LTSEAME cap is best for larger outside flue dimensions, from 16 by 19 inches to 21 by 24 inches. Its adjustable metal bars, long bolts, and screws are intended to help secure a fit across that range. The cap is made from stainless steel.
Its uniform mesh is designed to allow air circulation and smoke exhaust while screening the flue. Choose this if your tile is in the listed larger-size range and you need an adjustable cap. Limitation: its fit range starts larger than the other options in this list, so it is not suited to smaller flues.
Buying Guide: How to Choose an Outside Mount Chimney Cap
How should you measure the flue?
Measure the outside width and length of the tile at its top. Compare both measurements with the product’s stated fit range. A nominal cap size, such as 14 by 21 inches, is not necessarily the same as the tile dimensions it can cover.
Should you choose galvanized steel or stainless steel?
The listed products include both materials. Galvanized options include the HY-Guard, Stanbroil, and 9-by-18-inch cap. The BUYYAH and LTSEAME models are stainless steel; BUYYAH specifies 304 stainless steel. Compare the stated material and fit range, and follow the product’s installation instructions.
What should the mesh and mounting design do?
Mesh helps screen the flue from animals, birds, and debris while allowing airflow. An outside-mount or adjustable-bottom design can be relevant when the cap attaches around an existing clay tile. Check how the specific model mounts and whether its listed dimensions match your flue.
Frequently Asked Questions
What is an outside mount chimney cap?
It is a cap designed to attach around the exterior of an existing chimney flue tile rather than fit inside the flue opening. Confirm the mounting method for the model you select.
How do I know which cap size to buy?
Measure the outside width and length of the flue tile, then compare both numbers with the product’s stated fit range.
Can a chimney cap help keep animals and leaves out?
The listed caps use mesh or a grid designed to help block animals, birds, and leaves while allowing ventilation.
Do all outside mount caps fit clay flue tiles?
No. Fit varies by model and size. Check the product’s listed mounting style and dimensional range before buying.
Are these caps made from the same material?
No. This selection includes galvanized steel and stainless steel models. Review the material details for the specific cap you are considering.